If you swapped the center section of a 55-64 axle with the bolt-in center, no sweat. If you changed the ring & pinion of an integral-carrier axle, good luck! There's about a 1 in 1,000 chance of hitting all the clearances, bearing preloads, and tooth contact patterns right on the first try.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!